An engineer configures a WLAN with fast transition enabled. Some legacy clients fail to connect to this WLAN. Which feature allows the legacy clients to connect while still allowing other clients to u

Question

Options

• Aover the DS
• Badaptive R
• C802.11V
• D802.11k

• A
  5% (2)
• B
  89% (34)
• C
  3% (1)
• D
  3% (1)

Explanation

Adaptive FT (Fast Transition) is the correct answer because it allows a WLAN to support both 802.11r (Fast Transition) and non-802.11r (legacy) clients simultaneously on the same SSID. It intelligently identifies whether a client supports fast transition based on its OUI (Organizationally Unique Identifier) and applies the appropriate authentication method accordingly, solving the compatibility problem without requiring separate SSIDs.

Why the distractors are wrong:

• A (Over the DS): This is a mode of Fast Transition (roaming over the Distribution System), not a compatibility feature for legacy clients.
• C (802.11v): This is a BSS Transition Management standard that helps clients roam more efficiently, but it does not address FT compatibility with legacy devices.
• D (802.11k): This is a Radio Resource Management standard that helps clients discover neighboring APs, but again does not resolve FT/legacy client compatibility.

Memory Tip: Think of Adaptive FT as "adaptive" meaning it adapts to whatever the client supports - FT-capable clients get fast transition, legacy clients get standard authentication. The word "adaptive" is your clue that it flexibly adjusts based on the client's OUI.

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